KCSE Past Papers 2016 Biology Paper 1 (231/1)

2016 Biology Paper 1

Answer all the questions in the spaces provided.

1. (a) State two ways in which the muscles of the mammalian heart are special. (2 marks)

(b) Name the type of muscles found in the following organs. (2 marks) Stomach Bone

2. Why are plants able to accumulate most of their waste products for long? (2 marks)

3. State the importance of tactic responses among members of Kingdom Protista. (2 marks)

4. (a) Name one defect of the circulatory system in humans. (1 mark)

(b) State three functions of blood other than transport. (3 marks)

5. State the economic importance of anaerobic respiration in plants. (1 mark)

6. Explain continental drift as evidence of evolution. (3 marks)

(a) Name one defect of the circulatory system in humans. (1 mark)

7. Explain how the following prevent self pollination.

(i) Protandry (1 mark)

(ii) Self-sterility (I mark)

8. State three functions of Golgi apparatus. (3 marks)

9. (a) Name two structures of gaseous exchange in aquatic plants. (2 marks)

(b) What is the effect of contraction of the diaphragm muscles during breathing in mammals. (3 marks)

10. (a) State two disadvantages of sexual reproduction in animals. (2 marks)

(b) State two functions of a placenta. (2 marks)

11. Name two benefits that a parasite derives from its host. (2 marks)

12. Other than using a quadrat give two methods that can be used to estimate the population of grass. (2 marks)

13. (a) State two factors that affect enzymatic activities. (2 marks)

(b) Explain how one of the factors stated in (a) above affects enzymatic activities. (1 mark)

14. Give three factors that determine the amount of energy a human being requires in a day. (3 marks

15. (a) What is seed dormancy? (1 mark)

(b) Name a growth inhibitor in seeds. (1 mark)

16. State one use of each of the following excretory products of plants. (2 marks)

(i) Colchicine

(ii) Papain

17. State the name given to the study of:—

(i) The cell (1 mark)

(ii) Micro-organisms (1 mark)

18. Distinguish between haemolysis and plasmolysis. (2 marks)

19. Explain why it is not advisable to be in a poorly ventilated room with a burning charcoal stove. (3 marks)

20. State three factors that contribute to the deceleration phase in the population curve of an organism. (3 marks)

21. The figure below illustrates a food web in a certain ecosystem.

(a) Draw the shortest food chain

(b) Identify the organism with the highest:

(i) number of predators

(ii) biomass (1 mark)

22. State three characteristics of the class Crustacea. (3 marks)

23. (a) Name one salivary gland in humans. (1 mark )

(b) State two functions of saliva. (2 marks)

24. How does nutrition as a characteristic of living organisms differ in plants and animals. (2 marks)

25. Distinguish between diffusion and osmosis. (2 marks)

26. State the functions of the following pans of a microscope. (2 marks)

(a) Objective Lens

(b) Diaphragm

27. (a) What is single circulatory system? (1 mark)

(b) Name an organism which has a single circulatory system. ( I mark)

(c) Name the opening to the chamber of the heart of an insect. (I mark)

28. The diagram below shows a transverse section of a plant organ.

(a) Name the plant organ from which the section was obtained. (1 mark)

(b) (i) Name the class to which the organism from which section was obtained belongs. (1 mark)

(ii) Give a reason for your answer in b (i) above. (1 mark)

29. (a) State a characteristic that is common to all cervical vertebrae. (1 mark)

(b) Name two tissues in plants that provide mechanical support. (2 marks)

30. State two advantages of hybrid vigour. (2 marks)

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